Study of the influence of titanium and niobium particle size on the Ti35Nb alloy production with controlled porosity

Materia

article

Francis Faria Goulart¹  Alexandre Antunes Ribeiro²  Débora Vieira Way²  Lais de Souza Alves²  Carlos Angelo Nunes³  Lucas Moreira Ferreira³  Roseli Marins Balestra¹ 

[1] Universidade Federal de São João Del-Rei;Instituto Nacional de Tecnologia;Universidade de São Paulo

关键词: Titanium-niobium alloy;    Particle size;    Powder metallurgy;    Porosity;    Biomaterials;   

DOI  :  10.1590/1517-7076-RMAT-2022-0072

学科分类：工程和技术（综合）

来源: Universidade Federal do Rio de Janeiro * Coordenacao dos Programas de Pos-Graduacao de Engenharia

【 摘 要 】

The present work is a continuation of the research carried out in a previous work, with the aim of improving the production of Ti35Nb alloy by reducing the particle size of Ti (from 50–149 Μm to < 53 Μm) and Nb (from 31–500 Μm to < 62 Μm) powders. Micro (MI) and Macroporous (MA) Ti35Nb alloy samples were processed by powder metallurgy. Ammonium bicarbonate (AB) was utilized as pore former additive for processing MA samples. The powders were mixed, uniaxially pressed and then sintered at 1300 ºC for 2 hours under argon atmosphere. The samples were characterized by SEM/EDS, XRD, profilometry, and Vickers hardness test. The porosity levels were determined by geometric method, Archimedes’ principle and quantitative metallographic analysis. The results showed that the processing parameters used in this work successfully produced porous Ti35Nb alloys with completely stabilized β-Ti phase, indicating an enhancement in the methodology when compared with those reported in previous work. Smaller particle sizes influenced positively on the chemical-physical properties of MI and MA samples, since they demonstrated an improvement in the their characteristics, such as: more homogeneous microstructure; better particle consolidation; homogeneous elemental distribution with no relevant chemical contamination; porosity values in accordance with literature; presence of low amounts of titanium oxides on the surfaces which can improve the biocompatibility features; suitable surface roughness parameters for bone implant applications and favouring adhesion of bioceramic coatings; more uniform microhardness values for both samples which make the material with a further predictable mechanical behavior.

【 授权许可】

CC BY